Please read this:
"The primary fact to keep in mind is: the government must deny any link between vaccines and autism, because to admit the connection would force it to pay out gigantic sums of money to parents, under its Vaccine Injury Compensation Program (VICP).
"If your vaccine-damaged child has been diagnosed with any of the following medical conditions [list], you may be able to win financial support. If not, you're out of luck."
Autism isn't on the list."
Long story short - the vaccine injury programs is very unlikely to reward money if you say your child's autism was caused by vaccines. If you intend to try and get money out of the VCIP, this is something you need to know and weigh before persuing a formal autism diagnosis.